Package org.marketcetera.modules.cep.esper

Class CEPEsperProcessor.ExternalTimeDelegate

java.lang.Object

org.marketcetera.modules.cep.esper.CEPEsperProcessor.RegularDelegate

org.marketcetera.modules.cep.esper.CEPEsperProcessor.ExternalTimeDelegate

All Implemented Interfaces:

CEPEsperProcessor.ProcessingDelegate

Enclosing class:

CEPEsperProcessor

private class CEPEsperProcessor.ExternalTimeDelegate
extends CEPEsperProcessor.RegularDelegate

Responsible for implemneting external time behaviour - instead of sending the querieis straight to Esper, we wait until the first time event comes in, and only start CEP then

Field Summary

Fields

Modifier and Type	Field	Description
private Map<DataFlowID,List<Pair<DataEmitterSupport,String[]>>>	mUnprocessedRequests

Constructor Summary

Constructors

Modifier	Constructor	Description
private	ExternalTimeDelegate()

Method Summary

Modifier and Type	Method	Description
void	cancelRequest(DataFlowID inFlowID, RequestID inRequestID)	Go through and destroy all the existing EPL statements
void	preProcessData(DataFlowID inFlowID, Object inData)	Seed the Esper engine with the incoming time event, then delegate to the regular processRequest(String[], DataEmitterSupport) implementation.
void	processRequest(String[] inStmts, DataEmitterSupport inSupport)	Cache the incoming requests - they will be kicked off after we receive the first time event within preProcessData(DataFlowID, Object).

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

mUnprocessedRequests

private final Map<DataFlowID,List<Pair<DataEmitterSupport,String[]>>> mUnprocessedRequests

Constructor Detail

ExternalTimeDelegate

private ExternalTimeDelegate()

Method Detail

processRequest

public void processRequest(String[] inStmts,
                           DataEmitterSupport inSupport)

Cache the incoming requests - they will be kicked off after we receive the first time event within preProcessData(DataFlowID, Object).

Specified by:

processRequest in interface CEPEsperProcessor.ProcessingDelegate

Overrides:

processRequest in class CEPEsperProcessor.RegularDelegate

Parameters:

inStmts - the query statements.

inSupport - the emitter support to emit data.

cancelRequest

public void cancelRequest(DataFlowID inFlowID,
                          RequestID inRequestID)

Description copied from class: CEPEsperProcessor.RegularDelegate

Go through and destroy all the existing EPL statements

Specified by:

cancelRequest in interface CEPEsperProcessor.ProcessingDelegate

Overrides:

cancelRequest in class CEPEsperProcessor.RegularDelegate

Parameters:

inFlowID - the flowID of the data flow to cancel.

inRequestID - the requestID of the data flow to cancel.

preProcessData

public void preProcessData(DataFlowID inFlowID,
                           Object inData)
                    throws StopDataFlowException

Seed the Esper engine with the incoming time event, then delegate to the regular processRequest(String[], DataEmitterSupport) implementation. If the incoming events aren't TimestampCarriers, then just discard them

Specified by:

preProcessData in interface CEPEsperProcessor.ProcessingDelegate

Overrides:

preProcessData in class CEPEsperProcessor.RegularDelegate

Parameters:

inFlowID - the data flowID.

inData - the received data.

Throws:

StopDataFlowException - if the data flow should be stopped.